Every year between the ages of 25 and 60, the physically inactive male will lose muscle mass and muscle strength at a rate of 0.5 percent and although this number may seem low, it adds up quickly. After the age of 60, male muscle loss doubles to about 1 percent every year. After 70, muscle mass and muscle strength declines by 2percent every year. This doubling continues every ten years until death.
Definition of intestine : the tubular part of the digestive tract that extends from the stomach to the anus â compare large intestine, small intestine See intestine defined for English-language learners
The intestines are the part of the digestive system between the stomach and the anus. They are all coiled up to fit inside your abdomen. 1  The small intestine is a tube about 6 metres long in an adult.2  It is greyish-purple in colour and is about 35mm wide.he intestines are part of the digestive system of the body. They are sometimes called the guts or bowels. This system deals with all the food and drink that you take into your body. You can learn more about the digestive system in the topic 'Your waste disposal system ' .